水撃を受ける有限長真直円管の動的挙動 : 第2報,薄肉円管の場合

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This paper describes a theory which has been developed for the prediction of fluid-pipe coupled oscillation phenomena in a very thin-walled, finite length pipe subject to water-hammer, together with the experimental verification of this theory. A simple straight pipe geometry is considered, and is analysed in terms of the propagation of pressure wave in the liquid and axial stress wave in the pipe wall. The method considers a distributed interaction between liquid and pipe motions along the pipe, as well as lumped interaction at the closed-free pipe end. The membrane shell theory neglecting the radial inertial force is employed for the motion of the pipe wall. Continuity and momentum equations for liquid and pipe metal, which include interaction terms, are transformed into the four equations of conservation form on fluid velocity and pressure, and on particle velocity and strain, respectively, and calculated numerically by the"two-step Lax-Wendroff method". Experimental investigations were carried out for stainless steel very thin-walled straight pipes whose boundary conditions were open-fixed/closed-free; very good agreement with the theory was shown for transient pressures and strains.
社団法人日本機械学会の論文
1988-12-25